DNA is constantly changing. You yourself have DNA mutations not found in either of your parents.

Quoting: Anonymous Coward 31290791

Really, so am i going to 'evolve' into a what, next step is a spirit creature?

Quoting: DGN

Your mutations are pretty much done when you are born. But regardless the mutations are there. Every generation will have mutations not found in the prior generation. So if you take a thousand generations and just what do you think will happen?